This is an off-topic post not relating to Angus boats specifically, but to stitch-and-glue construction. If this violates the forum rules, please feel free to delete!
I'm designing a stitch-and-glue camper top for a Toyota Prius (with design inspiration from the CLC Teardrop Camper). I'm posting because I can't decide whether or not to go with 4mm or 6mm for the hull panels.
My current plan is to use 4mm for the “hull” with fiberglass on both sides, and then 6mm (or possibly thicker for the “underside” that mounts to the roof. On the interior, there will be a handful of shallow ribs perpendicular to the chines (1.5–2" deep to avoid undermining the interior space).
This is my first S&G-designed craft, so I'm just looking for a sanity check. Does 4mm with both sides glassed seem reasonable?